Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window L Carnitine: Benefits, Side Effects, And Dosage, Per Dietitians L Carnitine for PCOS: Everything You Need to Know PCOS Nutrition Center Acetyl L Carnitine (ALCAR) Supplement for Horses Mad Barn